any gravity dropper style seatpost for ellsworth

Hi guys,saw a crank brother joplin on a friend's reign xo and l was quite impressed of the fact that you can easily drop your saddle on the fly and put it up again at a flick of the switch.Are there any seatpost with a 27.2 size? thanks

I purchased my direct from Gravity Dropper. Their posts range in price depending on options. I highly recommend the remote lever so you can drop your post on the fly while keeping both hands on the bar.